World No. 26 Hunter Mahan will be on hand to defend his title in an attempt to retain the Walter Hagen Cup when the 32 first-round matches begin on Wednesday, Feb. 20.

Brandt Snedeker and Phil Mickelson, world Nos. 4 and 10, are not in the field. The former withdrew due to sore ribs and the latter cited scheduled family obligations. Shane Lowry (No. 65) and Fredrik Jacobson (No. 66) will fill the vacated spots.